1.   And the interior walls were troweled with gray gypsum, which simulates the raw concrete Rothko intended for the space.

2.   He adds brown pigment to the raw concrete for an old color and tone, and sandblasts the limestone to make it appear weathered.

3.   If the hosts were nice, they would have left the visiting locker room unfinished, as in raw concrete.

4.   Members of the tiny community sleep on raw concrete next to a channel of water so fetid it almost bubbles.